kaiser



2 Sheets-Sheet l.

(No Model.)

G. KAISER. APPARATUS POR DRYING PASTEBOARD, 62o. 210,442,229.

Patented Deo. 9., 1890.

(No Model.) 2 Sheets-Sheet 2.

G. KAISER. APPARATUS FOR DRYING PASTEBOARD, 65o.

No. 442,229. Patented Deo. 9, 1890.

Zwwzgf idlnrrtn STATES PATENT rricn GUSTAV KAISER, OF CHEMNITZ, GERMANY.

APPARATUS FOR DRYING PSTEBOARD, Sao.

SPECIFICATION forming part of Letters Patent Application tiled April ll, 1890. Serial No. 347,490. (No model.) Patented in Germany August 5, 1886, No. 39,262,

No. 442,229, dated December 9, 1890.

and in Austria Hungary November 4, 1886, No. 30,906 aud-No. 55,701.

To all whom it may concer/fb:

Be it known that I, GUSTAV KAISER, engineer, of Chemnitz, Saxony, in the Empire of Germany, have invented certain new and useful Improvements in or relating to Apparatus tor Drying Paper, Pastelmard, Fabrics, and other Materials, (for which I have obtained patents of Germany, No. 30,262, date-d August 5, 1886, Additional Patent No. 48,440, dated March 1T, 1880; application for second additional patent ot December 27, 1880, and in Austria-Hungary, No. 250,900 and No. 55,701, dated .Novembert 1386,) oi which the following is a specification.

This invention has for its object to dry by means of hot air the paper, pasteboard, &c., as it comes from the hydro-extractor of a paper-machine.

Up to the present time the dryingot paper,

dac., was eiteeted in cylinders heated by steam. This method ot' drying. however, is attended by a great variety of drawbacks, ot which I will only mention the following principalones: First, the quality ot' the papel' is damaged in consequence ot the too rapid drying, and the product is not only stitt and brittle, but even its sizing is found to be less satisfactory than that of air-dried paper made ofthe same materials; second, in the case ot cellular materials the iiber partly loses its natural elasticity and supplcness, and when dissolved again produces a brittle substance. Besides, the bleaching ot' it is detrimental to its quality. By drying these materials by means of hot-air these inconveniences are Obviatethand the paper acquires a greater firmness and extensil'iility, as neither in the direction of its length nor width 1s the shrinking ot' the paper counteracted during the drying process, whereas in drying the paper by means of steam-heated cylinders and through the medium of felt not only is its shrinking prevented, but the paper is stretched in the direction of its length, and thus rendered less compact and strong. The object of this arrangement therefore is to carry the paper it is desired to dry toward a hot current ot air the temperature ot which is comparatively low at tirst, but gradually increases as the drying proceeds. In this arrangement the paper is carried round the cylinder heated with steam,but ata certain distance from the same, and the volume of air between the cylinder and the paper which is being dried is greater and uniformly increased. An arrangement answering this purpose is represented in the accompanying drawings, of which- Figure lisa side elevation partly in section; and Fig. 2, a front view, also partly in section.

It consists ot a series of stationary cylindrical heating-bodies E, connected with each other. The heating medium is admitted at E and escapes at E2, after having passed through the system. To the stationary heating-body E are secured the segments B, to which are attached the radial removable carriers orsupports F, forming the bearings of the shafts or rollers Il. A series ot' carrying-bands C are arranged round the rollers II and all the heating-bodies whereby7 the rotary motion is imparted to the rollers beyond the edges of the paper, while at the same time t-he paper is thus automatically guided over the rollers during its passage through the drying plant. The path ot the paper is thus by means of the rotary grimling-rollers made to extend at a certain distance from the heating-body, and the sheetor film ot paper coming from the telt roller-press or equivalent A is first carried round the cylinder, receiving theheating medium last,`and therefore giving off the least amount of heat, whereupon it passes to the remaining cylinders in succession.` The paper is thus passed over heated surfaces the temperature of which increases as the drying draws nearer to its close, so that it moves from the drying apparatus in a direction opposite to that pursued by the heating medium.

The carrier-bands C are set in motion by means of a shaft O through the medium of a pair of pulleys suitably connected with straps, and of the gearing l), in connection with a number of rollers or pulleys Q, as shown in the drawings, The material as it is dried is wound upon suitable rollers R. 4

In drying apparatus operating like the one here described, in which the material` to be dried is submitted to the action ot hot air in such manner that the air sweeping, as it were, over the material as it moves along becomes saturated with moisture, the change of air- IOO that is, the removal of the air thus saturated with water-, greatly induences the evaporation, so that the arrangement employed for this latter process becomes highly important, as the final result of the working of the Whole machine depends on the efficacy of the same.

In the drying apparatus described above a number of slotted or perforated tubes J are arranged to extend transversely t-hrough the spaces G between the moving web of paper and connected to the collecting-pipe K. This pipe K is connected, through a dischargepipe L, with a steam-jet ventilator N, or with a suitable fan or equivalent apparatus operated mechanically and discharging air through the pipe M. By means of such a steam-jet or air suction arrangement the air existing between the paper bands and the heating-cylinders, being saturated with water, is continually drawn oif and discharged into the atmosphere, while in the same proportion fresh air is admitted from the sides of the machine into the spaces G.

I claiml. In an apparatus for drying paper, pasteboard, and similar materials, the combination, with the series of' heated cylinders around which the material passes, and means, 'substantially as set forth, for holding the same out of contact with the cylinders, of a heated medium supply communicating with the cylinder around which the material last passes, a pipe passing from said cylinder to the next cylinder, from around which the paa per passes, and from the latter to the next, and so on throughout the series, whereby the heat is gradually reduced toward the end where the material enters, substantially as described.

2. In an apparatus for drying paper, pasteboard, and similar webs, the combination, with a stationary heated cylinder, of. a series of independent driven rollers arranged around its periphery and in proximity thereto, and over which the material is carried out of contact with the cylinder, substantially as described. Y

3. In an apparatus for drying paper, pasteboard, and 'similar webs, with the heated cylinders having the series of guide-rollers arranged around their peripheries, over which the paper passes out of contact with the cylinders, ot the perforated l pipes arranged in proximity to the cylinders, in communication with the exhaust apparatus, for withdrawing the vapor-laden air from the space between the web and cylinders, substantially as described. Y

In witness whereof I have hereunto signed my name in the witnesses.

GUSTAV KAISER.

Witnesses:

R. E. JAHN, H. DE SoTo.

the combination, I

presence of two subscribing 6o 

